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United States Patent | 5,544,157 |
Wenstrup ,   et al. | August 6, 1996 |
A calibration template for standardizing images taken with X-ray radiation includes an elongated parallelepiped box of dimensions of at least about 14" (35.56 cm) by 17" (43.18 cm), which are the standard dimensions of normal size X-ray film and computed radiography plates made predominantly of methyl methacrylate and including three sections arranged along the direction of elongation of the box including a thick body section having a first thickness, the sections having imbedded specimens simulating X-ray absorption characteristics of human body portions, including a needle with an eye, step wedge, nylon disks, and copper screens of varying mesh sizes; a thin body section having a thickness less than the first thickness and imbedded pairs of models; and a thoracic body section having a thickness less than the first thickness and including a natural sponge simulating the X-ray absorption characteristics of a human lung and a plurality of air pockets of varying depth in the transmission direction to simulate pneumothoraces on an X-ray film or computed radiography image.
Inventors: | Wenstrup; Robert S. (Wayland, MA); Fieno; Joseph J. (Charlotte, NC) |
Assignee: | Boston Test Tool Company (Winston-Salem, NC) |
Appl. No.: | 388244 |
Filed: | February 14, 1995 |
Current U.S. Class: | 378/18; 378/207 |
Intern'l Class: | G01D 018/00 |
Field of Search: | 378/18,56,162,165,204,207,98.2,98.12 |
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4550422 | Oct., 1985 | VanPelt et al. | 378/207. |
4638502 | Jan., 1987 | Yaffe. | |
4646334 | Feb., 1987 | Zerhouni | 378/18. |
4649561 | Mar., 1987 | Arnold | 378/207. |
4700058 | Oct., 1987 | Belanger et al. | 378/98. |
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4788707 | Nov., 1988 | Malamud et al. | |
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4962514 | Oct., 1990 | Hart et al. | 378/18. |
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5416816 | May., 1995 | Wenstrup et al. | 378/207. |
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